media/base/audio_buffer_unittest.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/audio_buffer.h"
   6 #include "media/base/audio_bus.h"
   7 #include "media/base/test_helpers.h"
   8 #include "testing/gtest/include/gtest/gtest.h"
   9
  10 namespace media {
  11
  12 static const int kSampleRate = 48000;
  13
  14 static void VerifyBusWithOffset(AudioBus* bus,
  15                                 int offset,
  16                                 int frames,
  17                                 float start,
  18                                 float start_offset,
  19                                 float increment) {
  20   for (int ch = 0; ch < bus->channels(); ++ch) {
  21     const float v = start_offset + start + ch * bus->frames() * increment;
  22     for (int i = offset; i < offset + frames; ++i) {
  23       ASSERT_FLOAT_EQ(v + i * increment, bus->channel(ch)[i]) << "i=" << i
  24                                                               << ", ch=" << ch;
  25     }
  26   }
  27 }
  28
  29 static void VerifyBus(AudioBus* bus, int frames, float start, float increment) {
  30   VerifyBusWithOffset(bus, 0, frames, start, 0, increment);
  31 }
  32
  33 static void TrimRangeTest(SampleFormat sample_format) {
  34   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
  35   const int channels = ChannelLayoutToChannelCount(channel_layout);
  36   const int frames = kSampleRate / 10;
  37   const base::TimeDelta timestamp = base::TimeDelta();
  38   const base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
  39   scoped_refptr<AudioBuffer> buffer = MakeAudioBuffer<float>(sample_format,
  40                                                              channel_layout,
  41                                                              channels,
  42                                                              kSampleRate,
  43                                                              0,
  44                                                              1,
  45                                                              frames,
  46                                                              timestamp);
  47   EXPECT_EQ(frames, buffer->frame_count());
  48   EXPECT_EQ(timestamp, buffer->timestamp());
  49   EXPECT_EQ(duration, buffer->duration());
  50
  51   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
  52
  53   // Verify all frames before trimming.
  54   buffer->ReadFrames(frames, 0, 0, bus.get());
  55   VerifyBus(bus.get(), frames, 0, 1);
  56
  57   // Trim 10ms of frames from the middle of the buffer.
  58   int trim_start = frames / 2;
  59   const int trim_length = kSampleRate / 100;
  60   const base::TimeDelta trim_duration = base::TimeDelta::FromMilliseconds(10);
  61   buffer->TrimRange(trim_start, trim_start + trim_length);
  62   EXPECT_EQ(frames - trim_length, buffer->frame_count());
  63   EXPECT_EQ(timestamp, buffer->timestamp());
  64   EXPECT_EQ(duration - trim_duration, buffer->duration());
  65   bus->Zero();
  66   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
  67   VerifyBus(bus.get(), trim_start, 0, 1);
  68   VerifyBusWithOffset(bus.get(),
  69                       trim_start,
  70                       buffer->frame_count() - trim_start,
  71                       0,
  72                       trim_length,
  73                       1);
  74
  75   // Trim 10ms of frames from the start, which just adjusts the buffer's
  76   // internal start offset.
  77   buffer->TrimStart(trim_length);
  78   trim_start -= trim_length;
  79   EXPECT_EQ(frames - 2 * trim_length, buffer->frame_count());
  80   EXPECT_EQ(timestamp + trim_duration, buffer->timestamp());
  81   EXPECT_EQ(duration - 2 * trim_duration, buffer->duration());
  82   bus->Zero();
  83   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
  84   VerifyBus(bus.get(), trim_start, trim_length, 1);
  85   VerifyBusWithOffset(bus.get(),
  86                       trim_start,
  87                       buffer->frame_count() - trim_start,
  88                       trim_length,
  89                       trim_length,
  90                       1);
  91
  92   // Trim 10ms of frames from the end, which just adjusts the buffer's frame
  93   // count.
  94   buffer->TrimEnd(trim_length);
  95   EXPECT_EQ(frames - 3 * trim_length, buffer->frame_count());
  96   EXPECT_EQ(timestamp + trim_duration, buffer->timestamp());
  97   EXPECT_EQ(duration - 3 * trim_duration, buffer->duration());
  98   bus->Zero();
  99   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 100   VerifyBus(bus.get(), trim_start, trim_length, 1);
 101   VerifyBusWithOffset(bus.get(),
 102                       trim_start,
 103                       buffer->frame_count() - trim_start,
 104                       trim_length,
 105                       trim_length,
 106                       1);
 107
 108   // Trim another 10ms from the inner portion of the buffer.
 109   buffer->TrimRange(trim_start, trim_start + trim_length);
 110   EXPECT_EQ(frames - 4 * trim_length, buffer->frame_count());
 111   EXPECT_EQ(timestamp + trim_duration, buffer->timestamp());
 112   EXPECT_EQ(duration - 4 * trim_duration, buffer->duration());
 113   bus->Zero();
 114   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 115   VerifyBus(bus.get(), trim_start, trim_length, 1);
 116   VerifyBusWithOffset(bus.get(),
 117                       trim_start,
 118                       buffer->frame_count() - trim_start,
 119                       trim_length,
 120                       trim_length * 2,
 121                       1);
 122
 123   // Trim off the end using TrimRange() to ensure end index is exclusive.
 124   buffer->TrimRange(buffer->frame_count() - trim_length, buffer->frame_count());
 125   EXPECT_EQ(frames - 5 * trim_length, buffer->frame_count());
 126   EXPECT_EQ(timestamp + trim_duration, buffer->timestamp());
 127   EXPECT_EQ(duration - 5 * trim_duration, buffer->duration());
 128   bus->Zero();
 129   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 130   VerifyBus(bus.get(), trim_start, trim_length, 1);
 131   VerifyBusWithOffset(bus.get(),
 132                       trim_start,
 133                       buffer->frame_count() - trim_start,
 134                       trim_length,
 135                       trim_length * 2,
 136                       1);
 137
 138   // Trim off the start using TrimRange() to ensure start index is inclusive.
 139   buffer->TrimRange(0, trim_length);
 140   trim_start -= trim_length;
 141   EXPECT_EQ(frames - 6 * trim_length, buffer->frame_count());
 142   EXPECT_EQ(timestamp + trim_duration, buffer->timestamp());
 143   EXPECT_EQ(duration - 6 * trim_duration, buffer->duration());
 144   bus->Zero();
 145   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 146   VerifyBus(bus.get(), trim_start, 2 * trim_length, 1);
 147   VerifyBusWithOffset(bus.get(),
 148                       trim_start,
 149                       buffer->frame_count() - trim_start,
 150                       trim_length * 2,
 151                       trim_length * 2,
 152                       1);
 153 }
 154
 155 TEST(AudioBufferTest, CopyFrom) {
 156   const ChannelLayout kChannelLayout = CHANNEL_LAYOUT_MONO;
 157   scoped_refptr<AudioBuffer> original_buffer =
 158       MakeAudioBuffer<uint8>(kSampleFormatU8,
 159                              kChannelLayout,
 160                              ChannelLayoutToChannelCount(kChannelLayout),
 161                              kSampleRate,
 162                              1,
 163                              1,
 164                              kSampleRate / 100,
 165                              base::TimeDelta());
 166   scoped_refptr<AudioBuffer> new_buffer =
 167       AudioBuffer::CopyFrom(kSampleFormatU8,
 168                             original_buffer->channel_layout(),
 169                             original_buffer->channel_count(),
 170                             original_buffer->sample_rate(),
 171                             original_buffer->frame_count(),
 172                             &original_buffer->channel_data()[0],
 173                             original_buffer->timestamp());
 174   EXPECT_EQ(original_buffer->frame_count(), new_buffer->frame_count());
 175   EXPECT_EQ(original_buffer->timestamp(), new_buffer->timestamp());
 176   EXPECT_EQ(original_buffer->duration(), new_buffer->duration());
 177   EXPECT_EQ(original_buffer->sample_rate(), new_buffer->sample_rate());
 178   EXPECT_EQ(original_buffer->channel_count(), new_buffer->channel_count());
 179   EXPECT_EQ(original_buffer->channel_layout(), new_buffer->channel_layout());
 180   EXPECT_FALSE(original_buffer->end_of_stream());
 181 }
 182
 183 TEST(AudioBufferTest, CreateEOSBuffer) {
 184   scoped_refptr<AudioBuffer> buffer = AudioBuffer::CreateEOSBuffer();
 185   EXPECT_TRUE(buffer->end_of_stream());
 186 }
 187
 188 TEST(AudioBufferTest, FrameSize) {
 189   const uint8 kTestData[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
 190                               15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
 191                               27, 28, 29, 30, 31 };
 192   const base::TimeDelta kTimestamp = base::TimeDelta::FromMicroseconds(1337);
 193
 194   const uint8* const data[] = { kTestData };
 195   scoped_refptr<AudioBuffer> buffer =
 196       AudioBuffer::CopyFrom(kSampleFormatU8,
 197                             CHANNEL_LAYOUT_STEREO,
 198                             2,
 199                             kSampleRate,
 200                             16,
 201                             data,
 202                             kTimestamp);
 203   EXPECT_EQ(16, buffer->frame_count());  // 2 channels of 8-bit data
 204
 205   buffer = AudioBuffer::CopyFrom(kSampleFormatF32,
 206                                  CHANNEL_LAYOUT_4_0,
 207                                  4,
 208                                  kSampleRate,
 209                                  2,
 210                                  data,
 211                                  kTimestamp);
 212   EXPECT_EQ(2, buffer->frame_count());  // now 4 channels of 32-bit data
 213 }
 214
 215 TEST(AudioBufferTest, ReadU8) {
 216   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
 217   const int channels = ChannelLayoutToChannelCount(channel_layout);
 218   const int frames = 10;
 219   const base::TimeDelta start_time;
 220   scoped_refptr<AudioBuffer> buffer = MakeAudioBuffer<uint8>(kSampleFormatU8,
 221                                                              channel_layout,
 222                                                              channels,
 223                                                              kSampleRate,
 224                                                              128,
 225                                                              1,
 226                                                              frames,
 227                                                              start_time);
 228   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 229   buffer->ReadFrames(frames, 0, 0, bus.get());
 230   VerifyBus(bus.get(), frames, 0, 1.0f / 127.0f);
 231
 232   // Now read the same data one frame at a time.
 233   bus->Zero();
 234   for (int i = 0; i < frames; ++i)
 235     buffer->ReadFrames(1, i, i, bus.get());
 236   VerifyBus(bus.get(), frames, 0, 1.0f / 127.0f);
 237 }
 238
 239 TEST(AudioBufferTest, ReadS16) {
 240   const ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 241   const int channels = ChannelLayoutToChannelCount(channel_layout);
 242   const int frames = 10;
 243   const base::TimeDelta start_time;
 244   scoped_refptr<AudioBuffer> buffer = MakeAudioBuffer<int16>(kSampleFormatS16,
 245                                                              channel_layout,
 246                                                              channels,
 247                                                              kSampleRate,
 248                                                              1,
 249                                                              1,
 250                                                              frames,
 251                                                              start_time);
 252   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 253   buffer->ReadFrames(frames, 0, 0, bus.get());
 254   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 255
 256   // Now read the same data one frame at a time.
 257   bus->Zero();
 258   for (int i = 0; i < frames; ++i)
 259     buffer->ReadFrames(1, i, i, bus.get());
 260   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 261 }
 262
 263 TEST(AudioBufferTest, ReadS32) {
 264   const ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 265   const int channels = ChannelLayoutToChannelCount(channel_layout);
 266   const int frames = 20;
 267   const base::TimeDelta start_time;
 268   scoped_refptr<AudioBuffer> buffer = MakeAudioBuffer<int32>(kSampleFormatS32,
 269                                                              channel_layout,
 270                                                              channels,
 271                                                              kSampleRate,
 272                                                              1,
 273                                                              1,
 274                                                              frames,
 275                                                              start_time);
 276   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 277   buffer->ReadFrames(frames, 0, 0, bus.get());
 278   VerifyBus(bus.get(), frames, 1.0f / kint32max, 1.0f / kint32max);
 279
 280   // Read second 10 frames.
 281   bus->Zero();
 282   buffer->ReadFrames(10, 10, 0, bus.get());
 283   VerifyBus(bus.get(), 10, 11.0f / kint32max, 1.0f / kint32max);
 284 }
 285
 286 TEST(AudioBufferTest, ReadF32) {
 287   const ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 288   const int channels = ChannelLayoutToChannelCount(channel_layout);
 289   const int frames = 20;
 290   const base::TimeDelta start_time;
 291   scoped_refptr<AudioBuffer> buffer = MakeAudioBuffer<float>(kSampleFormatF32,
 292                                                              channel_layout,
 293                                                              channels,
 294                                                              kSampleRate,
 295                                                              1.0f,
 296                                                              1.0f,
 297                                                              frames,
 298                                                              start_time);
 299   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 300   buffer->ReadFrames(10, 0, 0, bus.get());
 301   VerifyBus(bus.get(), 10, 1, 1);
 302
 303   // Read second 10 frames.
 304   bus->Zero();
 305   buffer->ReadFrames(10, 10, 0, bus.get());
 306   VerifyBus(bus.get(), 10, 11, 1);
 307 }
 308
 309 TEST(AudioBufferTest, ReadS16Planar) {
 310   const ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 311   const int channels = ChannelLayoutToChannelCount(channel_layout);
 312   const int frames = 20;
 313   const base::TimeDelta start_time;
 314   scoped_refptr<AudioBuffer> buffer =
 315       MakeAudioBuffer<int16>(kSampleFormatPlanarS16,
 316                              channel_layout,
 317                              channels,
 318                              kSampleRate,
 319                              1,
 320                              1,
 321                              frames,
 322                              start_time);
 323   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 324   buffer->ReadFrames(10, 0, 0, bus.get());
 325   VerifyBus(bus.get(), 10, 1.0f / kint16max, 1.0f / kint16max);
 326
 327   // Read all the frames backwards, one by one. ch[0] should be 20, 19, ...
 328   bus->Zero();
 329   for (int i = frames - 1; i >= 0; --i)
 330     buffer->ReadFrames(1, i, i, bus.get());
 331   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 332
 333   // Read 0 frames with different offsets. Existing data in AudioBus should be
 334   // unchanged.
 335   buffer->ReadFrames(0, 0, 0, bus.get());
 336   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 337   buffer->ReadFrames(0, 0, 10, bus.get());
 338   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 339   buffer->ReadFrames(0, 10, 0, bus.get());
 340   VerifyBus(bus.get(), frames, 1.0f / kint16max, 1.0f / kint16max);
 341 }
 342
 343 TEST(AudioBufferTest, ReadF32Planar) {
 344   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
 345   const int channels = ChannelLayoutToChannelCount(channel_layout);
 346   const int frames = 100;
 347   const base::TimeDelta start_time;
 348   scoped_refptr<AudioBuffer> buffer =
 349       MakeAudioBuffer<float>(kSampleFormatPlanarF32,
 350                              channel_layout,
 351                              channels,
 352                              kSampleRate,
 353                              1.0f,
 354                              1.0f,
 355                              frames,
 356                              start_time);
 357
 358   // Read all 100 frames from the buffer. F32 is planar, so ch[0] should be 1,
 359   // 2, 3, 4, ..., ch[1] should be 101, 102, 103, ..., and so on for all 4
 360   // channels.
 361   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, 100);
 362   buffer->ReadFrames(frames, 0, 0, bus.get());
 363   VerifyBus(bus.get(), frames, 1, 1);
 364
 365   // Now read 20 frames from the middle of the buffer.
 366   bus->Zero();
 367   buffer->ReadFrames(20, 50, 0, bus.get());
 368   VerifyBus(bus.get(), 20, 51, 1);
 369 }
 370
 371 TEST(AudioBufferTest, EmptyBuffer) {
 372   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
 373   const int channels = ChannelLayoutToChannelCount(channel_layout);
 374   const int frames = kSampleRate / 100;
 375   const base::TimeDelta start_time;
 376   scoped_refptr<AudioBuffer> buffer = AudioBuffer::CreateEmptyBuffer(
 377       channel_layout, channels, kSampleRate, frames, start_time);
 378   EXPECT_EQ(frames, buffer->frame_count());
 379   EXPECT_EQ(start_time, buffer->timestamp());
 380   EXPECT_EQ(base::TimeDelta::FromMilliseconds(10), buffer->duration());
 381   EXPECT_FALSE(buffer->end_of_stream());
 382
 383   // Read all 100 frames from the buffer. All data should be 0.
 384   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 385   buffer->ReadFrames(frames, 0, 0, bus.get());
 386   VerifyBus(bus.get(), frames, 0, 0);
 387 }
 388
 389 TEST(AudioBufferTest, Trim) {
 390   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
 391   const int channels = ChannelLayoutToChannelCount(channel_layout);
 392   const int frames = kSampleRate / 10;
 393   const base::TimeDelta start_time;
 394   const base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
 395   scoped_refptr<AudioBuffer> buffer =
 396       MakeAudioBuffer<float>(kSampleFormatPlanarF32,
 397                              channel_layout,
 398                              channels,
 399                              kSampleRate,
 400                              0.0f,
 401                              1.0f,
 402                              frames,
 403                              start_time);
 404   EXPECT_EQ(frames, buffer->frame_count());
 405   EXPECT_EQ(start_time, buffer->timestamp());
 406   EXPECT_EQ(duration, buffer->duration());
 407
 408   const int ten_ms_of_frames = kSampleRate / 100;
 409   const base::TimeDelta ten_ms = base::TimeDelta::FromMilliseconds(10);
 410
 411   scoped_ptr<AudioBus> bus = AudioBus::Create(channels, frames);
 412   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 413   VerifyBus(bus.get(), buffer->frame_count(), 0.0f, 1.0f);
 414
 415   // Trim off 10ms of frames from the start.
 416   buffer->TrimStart(ten_ms_of_frames);
 417   EXPECT_EQ(start_time + ten_ms, buffer->timestamp());
 418   EXPECT_EQ(frames - ten_ms_of_frames, buffer->frame_count());
 419   EXPECT_EQ(duration - ten_ms, buffer->duration());
 420   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 421   VerifyBus(bus.get(), buffer->frame_count(), ten_ms_of_frames, 1.0f);
 422
 423   // Trim off 10ms of frames from the end.
 424   buffer->TrimEnd(ten_ms_of_frames);
 425   EXPECT_EQ(start_time + ten_ms, buffer->timestamp());
 426   EXPECT_EQ(frames - 2 * ten_ms_of_frames, buffer->frame_count());
 427   EXPECT_EQ(duration - 2 * ten_ms, buffer->duration());
 428   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 429   VerifyBus(bus.get(), buffer->frame_count(), ten_ms_of_frames, 1.0f);
 430
 431   // Trim off 40ms more from the start.
 432   buffer->TrimStart(4 * ten_ms_of_frames);
 433   EXPECT_EQ(start_time + 5 * ten_ms, buffer->timestamp());
 434   EXPECT_EQ(frames - 6 * ten_ms_of_frames, buffer->frame_count());
 435   EXPECT_EQ(duration - 6 * ten_ms, buffer->duration());
 436   buffer->ReadFrames(buffer->frame_count(), 0, 0, bus.get());
 437   VerifyBus(bus.get(), buffer->frame_count(), 5 * ten_ms_of_frames, 1.0f);
 438
 439   // Trim off the final 40ms from the end.
 440   buffer->TrimEnd(4 * ten_ms_of_frames);
 441   EXPECT_EQ(0, buffer->frame_count());
 442   EXPECT_EQ(start_time + 5 * ten_ms, buffer->timestamp());
 443   EXPECT_EQ(base::TimeDelta(), buffer->duration());
 444 }
 445
 446 TEST(AudioBufferTest, TrimRangePlanar) {
 447   TrimRangeTest(kSampleFormatPlanarF32);
 448 }
 449
 450 TEST(AudioBufferTest, TrimRangeInterleaved) {
 451   TrimRangeTest(kSampleFormatF32);
 452 }
 453
 454 static scoped_refptr<AudioBuffer> MakeReadFramesInterleavedTestBuffer(
 455     SampleFormat sample_format,
 456     int sample_rate,
 457     ChannelLayout channel_layout,
 458     int channel_count,
 459     int frames) {
 460   switch (sample_format) {
 461     case kSampleFormatS16:
 462     case kSampleFormatPlanarS16:
 463       return MakeAudioBuffer<int16>(sample_format,
 464                                     channel_layout,
 465                                     channel_count,
 466                                     sample_rate,
 467                                     0,
 468                                     1,
 469                                     frames,
 470                                     base::TimeDelta::FromSeconds(0));
 471     case kSampleFormatS32:
 472       return MakeAudioBuffer<int32>(kSampleFormatS32,
 473                                     channel_layout,
 474                                     channel_count,
 475                                     sample_rate,
 476                                     0,
 477                                     65536,
 478                                     frames,
 479                                     base::TimeDelta::FromSeconds(0));
 480     case kSampleFormatF32:
 481     case kSampleFormatPlanarF32:
 482       return MakeAudioBuffer<float>(
 483           sample_format,
 484           channel_layout,
 485           channel_count,
 486           sample_rate,
 487           0.0f,
 488           65536.0f / std::numeric_limits<int32>::max(),
 489           frames,
 490           base::TimeDelta::FromSeconds(0));
 491     case kSampleFormatPlanarS32:
 492       return MakeAudioBuffer<int32>(
 493           sample_format,
 494           channel_layout,
 495           channel_count,
 496           sample_rate,
 497           0.0f,
 498           65536.0f / std::numeric_limits<int32>::max(),
 499           frames,
 500           base::TimeDelta::FromSeconds(0));
 501     case kSampleFormatU8:
 502     case kUnknownSampleFormat:
 503       EXPECT_FALSE(true);
 504       break;
 505   }
 506   return AudioBuffer::CreateEOSBuffer();
 507 }
 508
 509 static void ReadFramesInterleavedS32Test(SampleFormat sample_format) {
 510   const ChannelLayout channel_layout = CHANNEL_LAYOUT_4_0;
 511   const int channels = ChannelLayoutToChannelCount(channel_layout);
 512   const int frames = kSampleRate / 100;
 513   const base::TimeDelta duration = base::TimeDelta::FromMilliseconds(10);
 514   scoped_refptr<AudioBuffer> buffer = MakeReadFramesInterleavedTestBuffer(
 515       sample_format, kSampleRate, channel_layout, channels, frames);
 516   EXPECT_EQ(frames, buffer->frame_count());
 517   EXPECT_EQ(duration, buffer->duration());
 518
 519   int32* dest = new int32[frames * channels];
 520   buffer->ReadFramesInterleavedS32(frames, dest);
 521
 522   int count = 0;
 523   for (int i = 0; i < frames; ++i) {
 524     for (int ch = 0; ch < channels; ++ch) {
 525       EXPECT_EQ(dest[count++], (frames * ch + i) << 16);
 526     }
 527   }
 528   delete[] dest;
 529 }
 530
 531 TEST(AudioBufferTest, ReadFramesInterleavedS32FromS16) {
 532   ReadFramesInterleavedS32Test(kSampleFormatS16);
 533 }
 534
 535 TEST(AudioBufferTest, ReadFramesInterleavedS32FromS32) {
 536   ReadFramesInterleavedS32Test(kSampleFormatS32);
 537 }
 538
 539 TEST(AudioBufferTest, ReadFramesInterleavedS32FromF32) {
 540   ReadFramesInterleavedS32Test(kSampleFormatF32);
 541 }
 542
 543 TEST(AudioBufferTest, ReadFramesInterleavedS32FromPlanarS16) {
 544   ReadFramesInterleavedS32Test(kSampleFormatPlanarS16);
 545 }
 546
 547 TEST(AudioBufferTest, ReadFramesInterleavedS32FromPlanarF32) {
 548   ReadFramesInterleavedS32Test(kSampleFormatPlanarF32);
 549 }
 550
 551 }  // namespace media